Molding-machine.



UNITED STATES PATENT OFFICE.

WILFBED LEWIS, OF HAVERFORD. PENNSYLVANIA, ASSIGNOR. TO THE TABOR MANU- FACTURING COMPANY, OF PHILADELPHIA PENNSYLVANIA, A CORPORATION OF PENNSYLVANIA.

MOLDING-MACHINE.

Specification of Letters Patent.

To all whom it may concern:

lie it known that I, VVILrniln LEWIS, a citizen of the United States, residing at Haverford, in the county of Montgomery and State of Pennsylvania, have invented certain new. and useful Improvements in Molding Machines, of which the following is a specification.

The present invention relates to improvements in molding machines of the type constituting the subject-matter of my application, Serial No. 183,055, filed July 27th, 1917, and its principal objects are to effect an economy and improvement in the application and use of tho fluid under pressure by which the machine is operated, and to provide simple features of construction by which this can be accomplished.

The invention will be claimed at the end hereof, but will be first described in connection with the embodiment of it chosen for illustration in the accompanying drawings forming art hereof and in which there is illustrate principally in central section, so much of a molding machine as is necessary for a description of the invention.

. In the drawings 1, is a; cylindrical plunger chamber provided internally with spacedor separate port-channels 25, shown as arranged diametrically. 3, is a plunger provided with an air supply passage 4, and with an annular seat 5, of reduced diameter and with a groove 6. 7, is a solid, uncut, deformable ring, hereinafter called a valve ring, and it is loosely mounted on the plunger seat 5, and is provided with ports 8, in communication with the air passage 4,

i and arranged for cooperation with the port channels 25. By elliptical deformation the.

valve ring is caused to hug the cylindrical wall of the chamber 1 at opposed points and in the neighborhood of the ports 8, as will be more fully described. 10, is a locking ring arranged in the roove 6, and operating to support the va ve ring 7. The locking rin 10, may be a split ring sprung over the en of the lunger after the valve ring has been slipped into its place thereon. i1, is a thimble introduced merely to cover possible inaccuracies in alincment of the pistons 13 and the port holes 8 and it is shown as provided with generally spherical ends of whi h one rests in a taper or conical seat surrounding the part 8, and of which Patented Mar. 19, 1918.

Serial No. 202,185.

the other rests in a similar seat 12, surrounding the opening through the hollow or tubular piston 13. One end of the piston 13, 1S exposed to the air supply 4. Two pistons and their complemental thimbles, diametri cally arranged, are shown, and they operate under air pressure to deform or spring the valve ring 7, somewhat elliptically and cause it to make a tight joint with the wall of the chamber 1, in the neighborhood or vicinity of the ports 8, and also to make tight joints between the abutting ends of the thimbles 11, and the ring 7, and the piston 13. This operation occu s when the parts are in the positions show because the pressure on the ends of the pistons 13, near 18,-is a spring between it follows that air under pressure may not blow through into the space 1, and thus an economy is effected and an improved mode.

of operation attained. If the ring Twears loose the original pressure can be readily restored by slightly peening the ring on a diameter at right angles to the ports 8. The effect of this peening is to give the ring a slight departure from circular form, causing it to hug the cylinder walls where close contact is desired to prevent leakage and waste of air. The space between the ring and its seat 5, limits the amount of eccentricity ultimately obtainable. As the ring swells or isdeformed in one direction it comes in or contracts in the other, but a I55 small difference will insure a very long life. Inasmuch as the end of the plunger 3, and

the cushion 17 (preferably of cork), contact to limit and fix the relative positions of the ports 8, and openings 2, as well as of other parts of the machine, a nice adjustment is required. This adjustment is provided by a cavity 14, between the cushion 17 and the head of the chamber 1, which cavity is pro vided with a sprue opening 15, through which a liner 16, of fusible metal is run. The liner 16, can be poured in while the machine is inverted with its parts wedged or liy moans (if u pouring SlfllKl ()1 plunger glV otherwise held in proper relative positions inc the proper depth of chamb'cr and which is inserted in the inverted chamber.

The machine is capable of :1 vari ty of uses.

its mode of opt-r: ion in shoclthss jar molding is as follows: 'l'li port lllll is con nocted with the atmosphere and air is llll,lD- duccd at the inlet 101. The air traverses the passage ll the openings. 9. into the space (1, raising the plunger 3 until air escapes by '2 into the hollow lnlsc of the machine and raises thc anvil member 102. which meets the descending plunger and thereafter air cs capes at 100. All of this occurs in thrordinary and well understood manner.

The machine can he used as a squcczcr. For this purpose air is admitted at 100, with the result that the anvil and everything connected with it and carried by it is lifted to ward a head, which is too common a provt sion of molding machines to require illu tration.

By removing the spring 103 and admitting air at 101.. the machine will operate as an ordinary jarring machine and the shock will be taken by the base of the machine.

What I claim is:

1. In a molding machine the combination of a plunger chamber and a plunger formed with ports of which the walls constitute valves, a cushion inthe head of the chamber for cooperation with the plunger to limit its stroke, a cavit arranged between the cushion and chum or head and having a sprue opening through the head, and a liner of fusible metal arranged in the cavity, sub stantially as described.

2. In a molding machine the combination of a plan or chamber provided internally with space port-channels, a plunger provided with an air supply passage, :1 deformable valve ring mo unte on the plunger and having ports in'comm'unication with the air passage and arranged for cooperation with the yvall of the chamber near the channels, and istons carried bythc plunger and exposed to the air supply and opcratin to deform the rin elliptically against. the chamber wall, sugstantlally as described.

3. In a molding machine the combination of a plunger-chamber provided internally with spaced port-channels, a plunger providedwith an air supply passage and having an external seatof reduced diameter and a groove, a deformable valve ring loosely mounted on the plunger seat and having ports in communication with said air pas-' sage and arranged for cooperation with said 5 channels and With the Wall of the chamber, a locking ring in said groove for supporting the valve ring. lhimblcs having packing joint contact. with the inner face of the valve ling. and lubnlar pistons carried by the plunger and having packing joint contact with the thimblsrs, and exposed to said air supply and operating on the thimblrs to do form the acking ring clliptically against the (fllfll'illK'F-Witll. snlistantially as dcsrvrribcd. H

l. In a molding machinc the conihimition of a plunger chamber provided intrrnally with spaced port channels, a plungcr provided with an air supply passage and having an external seat of reduced diameter and a 1.5

groove, :1 deformable valve ring loosely mounted on the seat and ha ring taper seats and ports in comnnmicatimi with the air passage and arranged for cotipcration with the wall of the chamber and with said chang0 nls, a locking ring in said groove for supporting the valve ring, tubular pistons carried by the plunger and citposed to the air supply and providcdwith taper seats, and

thimbles having spherical ends adapted to 35 said taper seats, substant-iall as described. 5.111 a molding machine the combination of a plunger chamber provided internally with spaced port-channels, a plunger provided with an air Supply passage, :1 continuand thimble's interposed between the 96 pistons and ring, substantially as described.

6. In a molding machine the combination of a-plunger chamber provided internally ith aced port-channels, a plunge-r providcd with an air supply passage and with 100 a reduced seat and a groove, a valve ring loosely mounted on the seat and provided with ports in communication with the air supply, a locking ring in the groove for supporting the valve ring, and pistons carried by the plunger and exposed to the air sup ply and operating to deform the valve ring elliptically, substantially as described.

7. In a molding machine the combination of a plunger chamber havin ports in opposed portions of its wall, a anger, a. solid deformable ring mounted oosely on the plunger, and means for deforming the ring elliptically against opposed portions of the chamber wall to function the ring as a valve, 116

substantially as described.

W'ILFRED LEWIS. 

